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Gnom [1K]3 years ago

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Answer:

less than 1%

Explanation:

The approximate percentage of the geologic time that humans have existed on the Earth since its origin is less than 1%.

The earth is about 4.6 billion years and much of its history has been without the present of human activities.

Hominis were the first human to appear on the surface of the earth.
This was in the Miocene epoch which was about 6 million years ago.
Compared to the age of the earth, this time lapse is very small and not up to 1%.
Life first appeared on earth about 3.5billion years.
Since then evolution has taken its due course to give what we have today.

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Anuta_ua [19.1K]

Her hypothalamus will secrete vasopressin. If her dehydration becomes severe, her secretion of vasopressin will increase.

<h3>What is vasopressin?</h3>

The posterior pituitary gland releases the peptide hormone vasopressin, also known as antidiuretic hormone.
Which is produced by the supraoptic and paraventricular nuclei of the hypothalamus (neurohypophysis).

It primarily functions as an anti-diuretic in the kidney, where it causes the body to reabsorb water by acting on the distal region of the nephron when it is dehydrated.
The AVP gene for it is found on human chromosome 20.
Vasopressin has an antidiuretic effect; it reduces the volume of urine by raising the collecting tube's water permeability.
It attaches to the G protein-coupled V2 receptor, which in turn starts a signaling cascade through the PKA.
Aquaporin 2 (a transmembrane pore) is produced as a result, and it is then transported to the apical/urinary membrane.